San Diego wakes up under a cloudy blanket this morning, with temperatures hovering near 66°F and a sticky marine layer that should thin by midday. Today, expect partly sunny skies and a high near 75°F, with patchy coastal fog returning tonight until tomorrow morning. While the coast keeps things mild, inland valleys and the county’s lower deserts are gearing up for much hotter conditions later this week.
Patchy Fog Mornings, Sunny Afternoons
Overnight, low clouds and patchy fog are likely to form again and linger into mid‑morning along the coast and far western valleys, before the sun finally breaks through by late morning. Most days, San Diego can expect highs in the mid‑70s, setting up comfortable afternoons at the beach and for most outdoor plans. Drivers, however, should be ready for reduced visibility on some early commutes near the shoreline.
Heat Risk Inland, Deserts Under Warning
According to the National Weather Service San Diego, inland valleys and mountains will heat up significantly, with a Heat Advisory in place from 10 AM tomorrow through 8 PM Thursday, and an Extreme Heat Warning in effect for the lower deserts from 10 AM today through 8 PM Thursday. Forecasters are calling for lower‑to‑mid 70s at the coast, mid‑90s to around 105°F across the Inland Empire, and blistering 113–117°F readings in the lower deserts tomorrow and Thursday. Anyone working or recreating in the inland areas is urged to reschedule activities if possible, stay hydrated, and take frequent breaks in the shade or in air-conditioned areas.
Boaters And Morning Commuters Watch
On the water, boaters should be ready for gusty conditions in the outer waters this afternoon and evening, with winds near 20–25 knots likely around San Clemente Island and a Small Craft Advisory posted for parts of the coastal waters. The onshore marine layer will help keep daytime temperatures cooler near shore, but it can also cut visibility for early‑morning boaters and drivers. If you head out, file a float plan, bring life jackets, and check local marine forecasts before you leave the dock.
Where To Cool Off
For those needing a break from the heat, San Diego County is urging residents to use designated “cool zones.” You can call 2‑1‑1 San Diego to find nearby options or check available air‑conditioned locations and hours. For more heat‑safety tips and local cooling resources, see the San Diego County News Center. Officials also recommend checking on elderly neighbors, limiting outdoor activities during peak heat, and calling 9‑1‑1 if anyone shows signs of heat stroke.
Bottom line: the coast stays relatively mild with patchy morning fog and highs in the mid‑70s, while inland communities, especially the deserts, are staring down dangerous heat on Wednesday and Thursday. Keep an eye on local forecasts, tweak outdoor plans inland if you can, and tap into county cooling resources to ride out the hottest stretch safely.
